/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License.  You may obtain a copy of the License at
*
*    http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

package ai.h2o.sparkling.utils

import scala.util.control.NonFatal

object ScalaUtils {
  def withResource[T <: AutoCloseable, R](resource: => T)(body: T => R): R = {
    val evaluatedResource: T = resource
    require(resource != null, "The auto-closable resource can't be null!")
    var exception: Throwable = null
    try {
      body(evaluatedResource)
    } catch {
      case NonFatal(e) =>
        exception = e
        throw e
    } finally {
      closeResource(evaluatedResource, exception)
    }
  }

  private def closeResource(resource: AutoCloseable, e: Throwable)= {
    if (e != null) {
      try {
        resource.close()
      } catch {
        case NonFatal(suppressed) => e.addSuppressed(suppressed)
      }
    } else {
      resource.close()
    }
  }
}
